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Servicing Rights - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]          
Commercial servicing rights $ 11,206   $ 11,206   $ 10,821
Other Noninterest Income          
Servicing Assets at Fair Value [Line Items]          
Mortgage servicing fees 616 $ 487 1,800 $ 1,400  
Commercial servicing rights          
Servicing Assets at Fair Value [Line Items]          
Commercial servicing rights 1,018   1,018   1,030
Commercial loans serviced for a third party $ 236,700   $ 236,700   $ 239,500
Constant prepayment rate     12.72%   12.72%
Discount rate     11.49%   11.49%